Electric-generator brush-holder



G. E. WILLEY.

ELECTRIC GENERATOR BRUSH HOLDER.

APPLICATION FILED MAY 21. 1921.

1,392,996, I Patented Oct. 11, 1921.

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INVEN TUR ATTDRNEY UNITED STATES "PATENT OFFICE.

' .oHAnLEsnwILLEY, or ouisvIL E, nam I t I Applica tion'fi'led May-27,

To all whom z't-mag cone-em Be it known that 1', GHARL S figwi-Lnnx' a citizen of the United States ofgAmerica, ree siding at Louisville in theicountyof J efferson and State-of I entucky have invented certain new and usefu l Improvements in Electric-Generator Brush-Holders, of which the following is a specification." I V I This inventionirelates to 'electric generators and motors andhas specialreference to a brush holder for devicesofth'is descrip tion. I

(L ne important objectof-the invention is to mprove the "general construction of Such. brush holders. I I

A second important object of the invention is 'to provide'an improved"springarrangement' for forcing the brush held by the holder, against the commutator or ringf a dynamo electric machine. W 57 l A thirdimportant object ofthe invention is to provide an improved construction-of brush holder wherein the friction due' .to the tension f spring bearing onthe brush holder arm'as in the ordinary construction, will be eliminated. a 1

A fourth importantobject ofthe'invention is to'provide animproved construction. of brush holder so arranged asto more effectivelyutilize the resiliency'of a' brush holder spring as well as to increase thelife thereof.

' Vith the above and other. objects in view,

the invention consists in general-of certain novel details of construction and'combinations of parts hereinafter' fully described, illustrated in the accompanyingdrawings, and specifically claimed.

In the accompanying drawings, like characters of reference indicate like parts in the several views, and I Figure 1 isa side elevation of a brush holder constructed in accordance with this invention.

Fig. 2 is a plan view thereof, the view showing a portion of the stud on the dynamo electric machine which is employed in mounting the brush holder.

Fig. 3 is an end view of the brush holder.

Fig. 4 is a plan View of the improved spring removed from the holder.

7 Fig. 5 is an end view of said spring.

Fig. 6 is an elevation showing a certain link employed in connection with this brush holder. g V

Fig. 7 is an edge view of said link.

In the embodiment "of the invention here nnnojrnrdoannnaron niiusn-rronnnn.

1921. Serial m 473,219. 5

' 1 i Specification of Letters Patent. I Patented 0017. 11, 1921. V

holder arm-having abody portion 10 pref- I erably made in the shape of a tapered 'I-be'am. At one end the arm 10 is bifurcated as at $11 and each arm of the bifurcation forms a bearing ring 12, which rings are of such sizes as to rotatably fit on the stud S of a dynamo electriomachine. At the other end of the arm 10.:there is provided a flat head 18 considerably broader .than the. arm and .thisendofthe arm also has on its upper side a boss 14 having ,a fiat surfacesubstantiallyat right anglestothe face of the head 13. In the upper face of the boss is provided a notch 15. brushand this brush sits against the flat face AtB is shown the ordinary of the head 13a-nd is held 1n position on that .by theiportion 19 against the head 13.

Between the rings 12 there is mounted on the stud S .a clamp ring having a body 20. Thisring is split and at each side of the split portion is a lug '21, one of-said lugs being threaded so that a shoulder screw 22 maybe passed through the other lug and screwed intotherthreaded lug to draw the lugs together and thusclamp the ring firmly on the stud S. It will be seen that when this ring is clamped on the stud the arm 10 is free to rise and fall but not move laterally.

Extending up from the ring 20 is a boss '23 having a flat uppersurfaceto support the fixed endof a leaf spring 24, said fixed end being held to the boss 23 by screws 25. This spring 24 extends through an opening 26 in a link 27, the opening 26 being located at the upper end of said link. The portion 16 of the brush clamp spring passes through a lower opening 28 formed in said'link so as to hold the lower end of the link in the notch 15 and the proportions ofthese parts are such that the spring 24: has its free end raised by the link 27 so that the brush B is constantly urged downward.

In order to provide an electrical connection'for the brush B a flat woven conductor 29 is secured beneath the spring 24; by the sn'ews 17 and 25 as clearly shown in Fig. 1. In assembling the device the clamp ring 20 is placed between the rings 12 withthe' slipped over at the stud S to the proper portion lengthwise of the stud. The clamp ring 20 is then rotated until the spring 24 presses on the link 27 with the proper force to hold the brush B in position. The screw 22 is then tightened and the clamp ring 20 locked in this position. a

With the construction it will be seen that the spring 24 is entirely free from the arm 10 and only acts on said arm through the link 27. Thus, since the link can tilt slightly there is practically no rubbing friction, on the spring due to oscillations of the arm 10 and, this friction being eliminated and the spring 24 free throughout its length, the full resiliency of the spring becomes effective on the brush. Furthermore wear of the spring due to rubbing is eliminated and consequently the life of the spring is prolonged.

There has thus been provided a simple and efiicient device of the kind described and for the purpose specified.

It is obvious that minor changes may be made in the form and construction of the invention without departing from the material principles thereof. It is not therefore desired to confine the invention to the exact form herewith shown and described, but it is wished to include all such as properly come within the scope claimed.

Having thus described the what is claimed as new, is

1. In a brush holder of the class described, an arm arranged for pivotal mounting on a stud, a brush clamp at the free end of saidarm, a clamp ring engageable on the stud, a leaf spring having one" end fixed to said ring, and means loosely connecting the other end of said spring and the arm adjacent its free end.

2.- In a brush holder of the class described, an arm arranged for pivotal mounting on a stud, a brush clamp at the free end of said arm, a clamp ring engageable immovably in fixed position on the stud, a leaf spring havinvention,

ing one end fixed to the ring and projecting longitudinally overthe arm, and a link connecting the free ends of said arm and spring.

3. In a brush holder of the class described, an arm arranged for pivotal mounting on a stud, a brush clamp at the free end of said arm, a clamp. ring engageable immova- 'bly in fixed position on the stud, a leaf spring having one end fixed to the ring and projecting longitudinally over the arm, and a link having its lower end loosely resting on the arm and provided adjacent its upper end with a slot wherethrough the free end of the spring passes.

1. In a brush holder of the class described, an arm arranged for pivotal mounting on a stud, a brush holder at the free end of said arm including a clamping spring having one end secured to the arm, an upstanding link at the free end of said arm having a slot adjacent each end, the fixed end of the spring passing through the lower of said slots, a clamp ring arranged for fixed mounting on the stud, and a spring having one end fixed to the clamp ring-and the other end passing through the upper of the link slots.

5. In a brush holder of the class described, anvarm bifurcated at one end and having the bifurcation in the form of journal rings adapted to fit revolubly on a stud, a clamp ring between the journal rings and having means toclamp the same in fixed position on the'stud, a head on said arm, a clamp spring arranged to cooperate with said head andhold a brush, said clamp spring havin one end fixedly secured to the arm, a lin having a slot adjacent each end, the fixed end of said spring extending through the lower slot, an upstanding boss on said clamp ring, and a leaf spring having one end fixed to the boss and the other end extending through the upper link slot,

In testimony whereof I afiix my signature.

I CHARLES E. IVILLE Y. 

